Carburetor



Feb. 6, 1923.

Wiimwes;

1,444,222. F. H. TREGO.

CARBURETOR.

FILED SEPT. 10, 1914.

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differ-718i].

and they are shown as Patented Feb. 6, 1923.

uunr' stares FRANK H. TREGO, OF DETROIT, MICHIGAN,

COMPANY, OF DETROIT, MICHIGAN, A

ASSIGNOR TO PACKARD MOTOR CAR CORPORATION OF MICHIGAN.

GARBURETOR.

Application filed September 10, 1914. Serial No. 861,055.

To all whom it may concern.

Be it known that I, FRANK H. TnEGo, a citizen of the United States, and resident of Detroit, Wayne County, State of Michigan, have invented certain new and useful lmprovements in Carburetors, of Which the following is a specification.

This invention relates to hydrocarbon motors and particularly to the construction of the carburetor and means for automatically adjusting certain of its moving parts.

One of the objects of the invention is to provide a carburetor having an adjustable venturi passage adjacent the fuel inlet.

Another object of the invention is to provide a carburetor having an adjustable venturi passage and adjustable fuel inlet.

Other objects of the invention will appear from the following description taken in connection with the drawings, in which:

Figure l is a vertical section through a carburetor built in accordance with the invention;

Figure 2 is a vertical section taken at right angles to that of Figure 1; and

Figure 3 is a section like Figure 1, showing the moving parts in a different position.

The carburetor 20, comprises two principal members, a carburetor body proper 21, and a float chamber 22. These two members may be connected together in any dcsiredmanner detachably connected by lugs and bolts 23, and a pipe 24. The float chamber 22 is of any suitable form and is shown particularly in Figure 1 as comprising a well 25 having a fuel inlet 26 supplied by pipe 27, a float 28 suspended in the fuel in the well and weighted operating levers 29 and a valve 30, which valve controls the fuel inlet 26. It will be understood that if fuel is drawn from the well 25 through the pipe 24 the level in the well will be lowered and the float will accordingly drop. This will cause the "weighted levers 29 to raise the valve 30 from its seat in the inlet 26 and permit additional fuel to flow into the chamber. As soon as the fuel reaches the normal level again the float will raise the levers 29 which will seat the valve 30. Thus the fuel is maintained at a constant level in the chamber.

The body of the carburetor is shown as of the horizontal type but the invention is not necessarily limited to this type of carburetor. As shown it FOIDPIlMs a casing 31. hot

water or hot air jacketed if desired as shown at 32, wlnch casing lncloses a horizontal passage 23 having an inlet 34 and an outlet 35. j

A suitable throttle valve 36 is arranged in the passage adjacent the outlet for the purpose of controlling the amount of mixture passing to the motor. The flange 37 is for connecting the carburetor body to the motor cylinders or to a proper intake pipe.

The passage 33 is somewhat contracted between the inlet and outlet as at 38, and the casing at this contracted portion is formed with oppositely arranged openings 39 and 40 intersecting the passage and shown as of rectangular form. In these openings are arranged suit-able members or blocks which slide into place and are arranged to be relatively adjusted so that their adjacent faces may be brought closely together or separated, for the purposes hereinafter explained.

()ne of these blocks shown as the lower block 41, is preferably secured in the lower opening 39 by the screws 42 and in itare formed suitable fuel passages leading from the pipe 24. This block therefore forms the outlet for the fuel into the carburetor, and the passages shown comprise a main passage 43 and several branch passages 44, all of which branch passages lead to a horizontal groove or slot 45 formed in the upper face of-the block. This slot is arranged approximately in line with the normal level of fuel in the float chamber so that normally the fuel is at approxin'iately the level shown in the drawing. As shown, two of the branch passages 44 are unrestricted in their connection with the main passage 43 but the right hand branch passage shown in Figure l is made adjustable by the needle valve 46 regulated by the thumb nut 47. This passage is the'primary passage to the carburetor being open at all times and controlled only by the valve 46 The other two passages shown are controlled by valves hereinafter described.

As shown in the drawings the upper block 48 is freely slidable in the opening 40 and the adjacent faces of both blocks 41 and 43 are preferably somewhat convex, as shown respectively at 49 and 50. This convexity is in the direction of the length of the passage 33 thus forming a still further contraction of that passage and giving to it the nature of a Venturi tube. lt will be understood that the block 48 is moved close! passing the fuel outlet is decreased.

to the block 41 to further contract the passage and thereby cause a greater velocity of air past the fuel inlet or nozzle for a given throttle opening.

In the construction of the invention herein illustrated the block 48 carries a valve 51 for each of the branch passages 44 except the primary passage. As there are two of such branch passages in the block 41 there are two valves 51 in the block 48 and these are shown'as of somewhat different length so they will act successively. That is, the left hand valve shown in l igure 1 is longer than the right hand valve 51 and both valves have springs 52, which hold them to their respective seats 53 formed at the upper ends of the branch passages 44. .Thus the block 48 may be moved downwardly until the left hand valve 51 seats and closes the left hand passage 44 and a further downward movement of the block 48 compresses the left hand spring 52 until the other valve 51 is seated. Then both springs are compressed by the further downward movement of the.

to obtain a correct proportion of fuel and air at all motor speeds.

The block 48 may be operated in any suitable manner as the distance between the blocks is increased, the velocity of theI air t is also apparent that the quantity of gasoline or other fuel supplied to the carburetor will be increased as the block 48 is thus raised due to the fact that the valves 51 have opened all of the branch passages 44 of the fuel outlet. Figure 3 illustrates the. block 48 in its wide open position with all of the branch passages 44 thus opened, while. Figure 1 shows the block 48 in approximately half open position with the left hand branch passage 44 closed. a

It will be understood that various modifications of the embodiment of the invention herein shown may be made without departing from the .spirit or scope of the invention. I

' Having thus described my invention, what 1 claim and desire to secure by'Letters Pat-- out is 1. A carburetorhaving an air passage, a

55 transversely movable element for varying the transversely movable element for varying the sage, and two independent means cooperating to control said outlet, one of which is carried by and operated by said air-passagevarying means and one of Which is operable independently thereof.

4. A carburetor having an air passage, and means for regulating the effective area of said passage, a fuel conduit having a fuel outlet into said passage comprising a plurality of fuel channels communicating with said air passage, and two independent means cooperating to control said outlet channels, one of which is carried by said air-passageregulating means and one of which is operable to control the flow of fuel from said outlet independently of the controlling effeet of the means operated by said air-passage-regulating means.

5. A carburetor having an air passage and transverse oppositely arranged openings therein, a block secured in one of said openings and extending into said passage, a fuel conduit having a fuel outlet through said block, guiding means in the other opening, a sliding block moving in said guiding means and adapted to move to and from the first block to vary the size of said air passage adjacent said. fuel outlet, and means for moving said sliding block.

6. A carburetor comprising a body having an air passage with oppositely disposedtransverse openings therein, guiding means mom of said openings, a sliding element in said opening guided by said means and adapted to move to vary the crosssectional area of said air passage, a block in the other opening provided with a fuel groove in its inner surface and a plurality of feed channels leading to said groove, and means for controlling the flow of fuel through said channels.

7. A carburetor having a horizontal air passage, the lower wall of said passage havng an open transverse fuel groove in its inner surface and a plurality of feed channels leading to said groove, means vertically movable towards and from the lower wall for contracting and expanding the air passage adjacent said groove, and means for successively closing said fuel feed channels as the air passage is contracted and vice versa.

8. A carburetor having a horizontal air passage, the lower wall of said passage having a transverse fuel groove and a plurality of feeds thereto, adjustable means for contracting the passage at said groove, means for closing one of said feeds as the passage is contracted and vice versa, and means for independently adjusting another of said feeds, said latter feed being unaffected by contracting said passa e.

'9. In a carburetor, fhe combination of a body having an air passage therethrough, with a transversely movable element adapted ,tovary the effective cross-sectional area of with a transversely movable element adapted to vary the effective cross-sectional area of said passage, a fuel conduit having an outlet to said passage adjacent the movable element, valve means carried by said element to increase the effective area of said fuel outlet as said element moves to increase said passage area, and manually operable means adjustable independently. of said valve means and cooperating therewith for. 'llmiting the outlet area at the minimum air-passage position of said element while permitting the valve means, when operating, to increase the outlet area without disturbing the adjustment ofthe said limiting means.

11. In a carburetor, the combination of a body having an air passage therethrough, of a transversely movable element for varying the effective cross-sectional area of said passage, a fuel conduit havinga fuel outlet to the passage adjacent said. element, means for increasing the flow of fuel as the flow of air through said passage increases comprising a valve carried by said element and operated to increase the effective area of said outlet as said element moves to increase said passage area, and manually operable means movable independently of said valve means for finely adjusting said outlet area at the minimum effective area position of said valve means without disturbing the functioning of said valve means.

12. Ina carburetor, the combination of a body having a horizontal air passage there through, fuel conduits having an outlet to the lower wall of said passage, a vertically reciprocal element mounted in the body of the carburetor above said fuel outlet and operated to vary the effective cross-sectional area of said passage, means for guiding said element in the sliding movement, a valve carried by and depending from said sliding element and arranged to cooperate with said fuel outlet to increase the flow of fuel when the sliding element moves to increase the size of the air passage, and a manually operable adjusting member cooperating with said valve 'tocontrol theflow of fuel from said outlet independently of the controlling effect of said valve means.

In testimony whereof I affix my signature in the presence of two witnesses. FRANK H. TREGO.

Witnesses:

LE Roi J. WILLIAMS, CLAIR J. Core. 

